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- Newsgroups: comp.os.msdos.misc
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!att!princeton!phoenix.Princeton.EDU!bathurst
- From: bathurst@phoenix.Princeton.EDU (Bruce Bathurst)
- Subject: Re: Virus Advice needed
- Message-ID: <1992Dec29.230130.3527@Princeton.EDU>
- Originator: news@nimaster
- Sender: news@Princeton.EDU (USENET News System)
- Nntp-Posting-Host: phoenix.princeton.edu
- Organization: Princeton University
- References: <Michel_Gerber.042m@bearsden.UUCP> <1hohdhINNr3t@crcnis1.unl.edu>
- Date: Tue, 29 Dec 1992 23:01:30 GMT
- Lines: 38
-
- In article <1hohdhINNr3t@crcnis1.unl.edu> vporguen@unlinfo.unl.edu (victor porguen) writes:
-
- >Remember: it doesn't infect or modify files. There is only ONE
- >specimen of the Stoned virus per disk or diskette, no more. But it
- >is a TSR, and stays in memory if you boot from an infected disk.
- >If so, it will infect ANY diskette you insert into the machine.
- >That's the only way it can enter a system: by booting or attempted
- >booting from an infecte disk, either system disk or not.
-
- Last week a friend asked me to fix a floppy--an original disk from a
- commercial program. The boot record (and following sector) had
- unusual code, so I suspected a boot-record virus. Because no messages
- were displayed on his screen, I guessed it was the Stoned virus, and
- checked the spot it places the correct boot record. There was
- code--out of place--but different from the correct boot code and
- different from that in the first sector. This was Michelangelo. The
- poor floppy caught one, then the other.
-
- An ordinary virus remover might well have carefully copied the
- Michelangelo over the Stoned, activating a very dangerous virus. So
- while it's true that your disk can have ony one copy of the Stoned
- virus, watch out!--similar infecters interact.
-
- I used the latest F-Prot to remove them both simultaneously (and
- installed its integrity checker).
-
- BTW, the little program in the boot record is run not only during
- booting, but any time the computer needs to know what medium is in the
- drive. This is why disks copy-protected with an odd format don't
- surprise your computer. In principle, if you insert a floppy with a
- boot-record infection and type "C:\DOS>dir a:", your machine can be
- infected.
-
- Bruce (Gypsy Scholar)
- --
- Department of Geological and Geophysical Sciences
- Princeton University, Princeton, NJ 08544
- bathurst@phoenix.princeton.edu bathurst@pucc.bitnet !princeton!phoenix!bathurst
-